Impeller for fluid pump

Abstract

An impeller ( 100 ) for a fluid pump according to the present invention comprises a shroud ( 150 ) that has a disk shape and is drivingly rotated about a center axis, and a cover ( 110 ) comprising a cover main body ( 120 ) having a truncated cone shape with an inlet port ( 123 ) for a fluid formed at a center and a plurality of blades ( 130 ) arranged around a center axis of the cover main body ( 120 ). The cover ( 110 ) and the shroud ( 150 ) are joined to each other with a welding contacting portion ( 135 ) and a welding contacted portion ( 177 ) welded to each other in a center axis direction, in a state where another end surface of the shroud ( 150 ) and a distal end portion ( 131 ) of the blades ( 130 ) are in parallel with each other.

1 . An impeller for a fluid pump, the impeller comprising:
 an impeller main body member that has a disk shape and is drivingly rotated about a center axis; and   an impeller cover member comprising:
 a cover main body having a truncated cone shape with an inlet port for a fluid formed at a center; and 
 a plurality of blades arranged around a center axis of the cover main body, wherein 
   the impeller main body member and the impeller cover member face each other in a center axis direction,   the cover main body comprises an inclined portion extending toward the impeller main body member in the center axis direction, while being inclined toward an outer side in a radial direction,   the plurality of blades are disposed on a side of the inclined portion facing the impeller main body member,   the blades each have a distal end portion, facing the impeller main body member in the center axis direction, provided with a welding contacting portion,   the impeller main body member comprises:
 one end surface facing the impeller cover member; 
 another end surface disposed on an opposite side of the one end surface in the center axis direction; 
 groove portions that are formed at positions matching the blades on the one end surface, and receive the distal end portions of the blades; and 
 a welding contacted portion that is formed in the groove portions and is capable of coming into contact with the welding contacting portion, and 
   the impeller main body member and the impeller cover member are joined to each other with the welding contacting portion and the welding contacted portion welded to each other in the center axis direction, in a state where the other end surface of the impeller main body member and the distal end portion of the impeller cover member are in parallel with each other.   
     
     
         2 . The impeller for a fluid pump according to  claim 1 , wherein
 the blades each comprise:
 the distal end potion; 
 a first outer surface continuing to a rear side of the distal end portion in a rotation direction; and 
 a second outer surface continuing to a front side of the distal end portion in the rotation direction, 
   the groove portions each comprise:
 a groove bottom portion that faces the distal end portion in a center axis direction; 
 a first inner surface that continues to a rear side of the groove bottom portion in the rotation direction, and comes into contact with the first outer surface; and 
 a second inner surface that continues to a front side of the groove bottom portion in the rotation direction, and faces the first inner surface, 
   the welding contacting portion is formed in a corner portion between the distal end portion and the second outer surface of the corresponding blade, and   the welding contacted portion, as an inclined surface, is formed on the second inner surface of the groove portion.